In this chapter we will cover the following recipes:

• Refactoring your plugin using a three-layer pattern
• Replacing your LINQ data access layer with QueryExpressions
• Logging an error from your customization
• Converting your plugin into a custom workflow activity
• Unit testing your plugin business logic
• Unit testing your plugin with an in-memory context
• Integration testing your plugin end-to-end
• Profiling your plugin
• Building a generic read audit plugin
• Using Cross-Origin Resource Sharing with CRM Online